Can Blender be used to send to a factory to create silicone products (mass production)?
AFAIK, CAD software and blender are not that different, especially for 3D printing. The main difference would be operation, and maybe some tools to make sure the object could be made with a mold. Just do some checks:

Make sure the geometry is watertight, commonly referred to as being manifold. You don’t want any holes!
Double check that all the normals are pointing the right way.
Make sure the mesh is high poly enough that the resulting product won’t look polygonal like a low-res video game object.

If you have already printed a few things with this model and they are totally fine, I’d say you’re good to go. :-)